Add deprecation notice in UPGRADE-2.7

mpdude · mpdude · commit dbec9200860b · 2015-04-06T20:18:19.000+02:00
diff --git a/UPGRADE-2.7.md b/UPGRADE-2.7.md
@@ -515,3 +515,10 @@ PropertyAccess
 
         new UnexpectedTypeException($value, $path, $pathIndex);
    ```
+
+Config
+------
+
+ * The `__toString()` method of the `\Symfony\Component\Config\ConfigCache` is marked as 
+   deprecated in favor of the new `getPath()` method.
+   
